Abstract: An abutment tooth model which can improve a mold releasable property of the prosthetic restoration (releasability from an abutment tooth model or a mold) and a method of manufacturing such a prosthetic restoration are provided The abutment tooth model is formed of a base material such as an ultra-hard plaster (CaSO4.2H2O), and at least one oxide selected from the group comprising Zr, Y and Ca. The abutment tooth model is formed so as to be slightly larger than the abutment tooth to the extent of the degree of shrinkage of the prosthetic restoration (green body) by taking the curing expansion upon molding and the thermal expansion upon sintering into account The abutment tooth is formed using a compound in which Ti powder or Tn alloy powder is contained as its main component, and the compound is built up onto the abutment tooth model 5 so as to have a desired shape, and thus obtained green body is subjected to a debinding treatment.

Abstract: A bone substitute material is prepared by firing and pulverizing animal bones into animal bone powder, mixing the animal bone powder and a divalent metal compound into a powdery mixture, and kneading the powdery mixture with chitosan sol. Alternatively, a bone substitute sheet is prepared by mixing at least one of apatite and animal bone powder with chitosan sol into a mixture, forming a pre-processed sheet of the mixture, and neutralizing the sheet by an aqueous solution of a compound. The bone substitute material and sheet have a pH value falling within a neutral range.

Abstract: A prosthetic restoration of the invention is made from a metal material containing Ti as the main component and from 0.01 to 3 wt % of M (were M is at least one element selected from the group comprising Si, Zr, Ca, P and In). Further, in addition to these materials, from 0.01 to 4 wt % of Q (where Q is at least one element selected from the group comprising Al, Sn, V ad Cu) may be contained. On an outer surface of such a metal material, a coating layer formed of porcelain or synthetic resin or the like can be provided. Such a prosthetic restoration can be manufactured as follows. First, a model of an abutment tooth is manufactured. Next, a compound is prepared by mixing and kneading metallic powder of Ti or an alloy containing Ti, powder composed of the M or a compound containing the M and a binder. In this case, the powder composed of Q or an compound containing the Q may be added.

Abstract: An artificial dental implant includes an implanting part which is to be implanted in bone tissue and a crown-fixing part to which a crown is to be fixed, which are manufactured using a metal powder injection molding method. At least a part of a portion of said implanting part which defines an outer surface thereof is formed with a metal material which contains Ti as a base material and 0.01 to 3 wt % of M (where M is at least one selected from the group comprising Ca, P and Si). Further, the implanting part preferably has a coating layer which covers the outer surface thereof, in which the M content (where M is at least one selected from the group comprising Ca, P and Si) in this coating layer is preferably greater than the M content in the at least a part of the portion of the implanting part. The implanting part and crown-fixing part may be formed into an integral body, or formed into separate bodies such that they are engaged with each other when used.

Abstract: A buccal tube has a base part and at least one tube, and it is formed from a metal material comprising Ti or Ti alloy, using a metal injection molding method. The buccal tube can be formed from a metal material which contains Ti as a base component, from 0.03 to 0.5 wt % C, from 0.08 to 0.8 wt % O and from 0.03 to 0.6 wt % N. The total C, O and N content in the metal material is preferably from 0.14 to 1.1 wt %. Furthermore, pores of average diameter from 0.5 to 50 .mu.m are preferably dispersed in at least a surface region of the buccal tube, and the porosity of the holes is preferably from 0.05 to 5.0 vol %. The buccal tube may further comprises at least one engaging part which is preferably formed into a hook or engaging piece for example.

Abstract: A dental-care device is constructed from a planar base and a wire receiving part positioned on the top surface of the planar base. Slots extending straight horizontally are formed at the center of the wire receiving part, and wire is passed through these slots. The device is preferably manufactured by a metal powder injection molding method, and is composed of metal material which contains Ti as the base component, C in an amount of from about 0.03-0.5 wt % by weight of the metal material, O in an amount of from about 0.08-0.8 wt % by weight of the metal material, and N in an amount of from about 0.03-0.6 wt % by weight of the metal material. A large number of pores may be scattered at least in the vicinity of the surface of the metal material. This device can be easily manufactured, has a good surface wetness characteristic, and has functional portions, such as portions of low friction and portions of superior adhesiveness.

Abstract: A dental care material comprising a titanium sintered body has no harmful effects on the human body and easily produces products with complicated shapes having a high level of strength. A mixture of titanium powder and an organic binder is injection molded and subjected to binder removal and sintering processes to form a bracket for orthodontic or dental implant materials. Pure titanium powder, with an average granule diameter of no more than 40 .mu.m, a carbon content by weight of no more than 0.3%, and an oxygen content by weight of no more than 0.6%, preferably is used to produce a titanium sintered body of combined carbon and oxygen content by weight of no more than 1.0%. Colored layers can be formed on the surface of the titanium sintered body using various methods as needed.

Abstract: An osteoinduction substance is extracted from animal bones and essentially comprises Mg, Si, Ca, and Na. The osteoinduction substance is manufactured by subjecting the animal bone to acid dipping, liming, neutralization, thermal extraction, condensation, and dehydration to obtain gelatin. The gelatin is then subjected to deproteinization under a nonheat or a low-temperature condition to extract the osteoinduction substance. The osteoinduction substance is mixed with at least one of hydroxyapatite powder and chitosan to form a bone filling material. When the osteoinduction substance is mixed with chitosan sol, a bone filling material of a sheet type is obtained.

Abstract: A dental care material comprising a titanium sintered body has no harmful effects on the human body and easily produces products with complicated shapes having a high level of strength. A mixture of titanium powder and an organic binder is injection molded and subjected to binder removal and sintering processes to form a bracket for orthodontic or dental implant materials. Pure titanium powder, with an average granule diameter of no more than 40 .mu.m, a carbon content by weight of no more than 0.3%, and an oxygen content by weight of no more than 0.6%, preferably is used to produce a titanium sintered body of combined carbon and oxygen content by weight of no more than 1.0%. Colored layers can be formed on the surface of the titanium sintered body using various methods as needed.

Abstract: An improved implant comprising a metallic base material and a coating layer of a ceramics which is formed by thermally sprayed firstly a bonding agent and secondly ceramic powders (optionally containing a porcelain) around the outersurface of the metallic base material. The implant has a sufficient mechanical strength (e.g. impact strength) and hence an excellent break-resistance and further a good affinity to tissues of living bodies and is useful for implantation in various bones including tooth roots and joints in living bodies.

Abstract: An improved porcelain fused to metal crown having a composite structure comprising layers of a bonding agent and ceramics and optionally a mixture of a bonding agent and ceramics and/or a mixture of ceramics and a porcelain, which are thermally sprayed around the metal crown, and a layer of fused porcelain formed on the above layers. The porcelain fused to the metal crown is useful for restoration of a defective tooth crown as an artificial tooth crown.

Abstract: An improved investment casting process for producing dental restorations, particularly a dental crown, comprising the steps of fixing a wax pattern onto a truncated cone in a metallic ring having a lining of a cushioning material, pouring an investment material into the space around the wax pattern in the metallic ring, drying the resultant product, melting out the invested wax pattern, curing the resultant product at a temperature of 700.degree. to 950.degree. C for 20 to 150 minutes to give a mold, fixing the mold thus obtained to a centrifugal casting machine and casting a molten chromium-cobalt and/or nickel alloy in the mold maintained at a temperature of 100.degree. to 500.degree. C.